The dream wakened a forgotten memory.

那梦唤起了一段忘却的记忆。

《牛津词典》

This time the scene was a little hazy, as if it were a long forgotten memory.

这次的情景让人有些困惑，它有些象是一段长长的被人遗忘的记忆。

youdao

In addition to the lack of academic support from parents, parental discipline seems to be a long-forgotten memory.

家长除了缺少学习上的支持以外，在纪律方面也甚少介入。

youdao

He had not forgotten his time at the citadel, but his memory was heavily veiled by his final days there and the days afterward, his arduous trek, the burrs and splinters of glass stinging his paws, the dense, watery taste of the bloated dead.

NEWYORKER: The Tiger��s Wife